When you're creating concept drawings, you can use the concept called sketch rendering. You not…
Vectorworks Tip 312 – Sketch Rendering by Object
You can apply sketch rendering to the entire view, but you can also apply sketch rendering object by object. If you select an object, then go to the Render pane of the Object Info pallete, you can choose what sketch style you want to apply to each object. You will only see the difference when you apply sketch rendering to the entire scene.